This class includes \(\tau \) -nice and \(\tau \) -list samplings [1]}. The \(\tau \) -nice sampling considers all elements of a power set of \([d]\)  with a fixed cardinality s.t. \(|\hat{S}| = \tau \) . There are \(\binom{d}{\tau }\)  of such subsets and each of them is equally probable. Consequently, the probability \((i \in \hat{S}) = \frac{\tau }{n}\) . On the other hand, the \(\tau \) -list sampling is restricted to ordered and consecutive subsets of the power set, with cardinality fixed to \(\tau \) .
